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Bluetooth audio has evolved from Basic Rate (BR) radio in 1999 to the modern LE Audio architecture introduced with Bluetooth 5.2. LE Audio replaces continuous point-to-point streams with isochronous channels (CIS for unicast, BIS/Auracast for broadcast), enabling precise scheduling, lower power consumption, and scalable delivery. The LC3 codec delivers better perceived audio quality at roughly half the bitrate of SBC. Key use cases covered include hearing aids (power-constrained, benefiting from CIS sleep scheduling), gaming headsets (stereo bidirectional audio up to 32 kHz with low latency), and public broadcast via Auracast (up to 100m range, unlimited receivers). Testing considerations include anthropomorphic fixtures like GRAS KEMAR and integrated Bluetooth 5 test modules.
